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Gravity: Analog TDS Sensor

SKU: SEN0244

Gravity: Analog TDS Sensor (SEN0244) is an affordable, waterproof-probe sensor for real-time water quality monitoring on Arduino (3.3-5.5V input, 0-1000ppm range). It comes with a pinout diagram, schematics, and step-by-step Arduino code — from basic TDS readings to full calibration — for applications like hydroponics and domestic water testing.

Overhead shot of a small TDS sensor module with red LED, wires, and power connector for Arduino-DFRobot product sku:SEN0244 image.

Downloadable Resources

  • Docs
  • Tech Specs
  • Projects
  • Blog
    • 1. Example Code for Arduino-Measure TDS Value

    This article demonstrates how to measure Total Dissolved Solids (TDS) using Arduino by providing detailed hardware and software preparations, a wiring diagram, cautions, and sample code for accurate readings.
    2. Example Code for Arduino-Calibrate and Measure TDS Value

    The article offers a detailed guide on how to calibrate and measure TDS values using Arduino with the analog TDS sensor. It includes hardware and software setup, wiring instructions, sample code, and step-by-step calibration procedures, ensuring accurate sensor readings and effective temperature compensation.

    Specification

    • Signal Conditioner Board
    Parameter Specification
    Input Voltage 3.3 ~ 5.5V
    Output Voltage 0 ~ 2.3V
    Working Current 3 ~ 6mA
    TDS Measurement Range 0 ~ 1000ppm
    TDS Measurement Accuracy ± 10% F.S. (25 ℃)
    Module Size 42 * 32mm
    Module Interface PH2.0-3P
    Electrode Interface XH2.54-2P
    • TDS probe
    Parameter Specification
    Number of Needle 2
    Total Length 83cm
    Connection Interface XH2.54-2P
    Colour Black
    Other Waterproof Probe

    Pinout

    Analog_TDS_Sensor_Pinout

    Num Label Description
    1 - Power GND(0V)
    2 + Power VCC(3.3 ~ 5.5V)
    3 A Analog Signal Output(0 ~ 2.3V)
    4 TDS TDS Probe Connector
    5 LED Power Indicator

    FAQ

    • Does this sensor have a temperature sensor? How to make the temperature compensation?
      This TDS probe has no temperature sensor, but the temperature compensation algorithm is reserved in the sample code. The temperature variable in the sample code will default to 25 °C without a temperature sensor. You can add a waterproof temperature sensor to read the temperature,then update the temperature variable, to make automatic temperature compensation.

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